After looking through the sentence comparison examples, what do you think the guidelines are that tell you when to use the different forms of "you?" Write down your thoughts about this grammar principle. Specifically, write down a "rule" that you think Spanish uses to explain the difference between tú and usted. Then check out the grammar pattern in the next link to see if your hunch was correct.

When addressing someone who you are unfamiliar with, someone with higher authority, or someone who is older like a grandparent or principally, you use usted. When you are talking to someone familiar like your cousin or friend, you refer to them as tú.

Explanation:

the first is correct, the second is "la tienda de descuentos" meaning "the discount store", and the third is "ayer" meaning "yesterday".